Add solution #715

Author: JoshCrozier

0715-range-module.js

@@ -0,0 +1,79 @@
+/**
+ * 715. Range Module
+ * https://leetcode.com/problems/range-module/
+ * Difficulty: Hard
+ *
+ * A Range Module is a module that tracks ranges of numbers. Design a data structure to track the
+ * ranges represented as half-open intervals and query about them.
+ *
+ * A half-open interval [left, right) denotes all the real numbers x where left <= x < right.
+ *
+ * Implement the RangeModule class:
+ * - RangeModule() Initializes the object of the data structure.
+ * - void addRange(int left, int right) Adds the half-open interval [left, right), tracking every
+ *   real number in that interval. Adding an interval that partially overlaps with currently tracked
+ *   numbers should add any numbers in the interval [left, right) that are not already tracked.
+ * - boolean queryRange(int left, int right) Returns true if every real number in the interval
+ *   [left, right) is currently being tracked, and false otherwise.
+ * - void removeRange(int left, int right) Stops tracking every real number currently being tracked
+ *   in the half-open interval [left, right).
+ */
+
+var RangeModule = function() {
+  this.ranges = [];
+};
+
+/**
+ * @param {number} left
+ * @param {number} right
+ * @return {void}
+ */
+RangeModule.prototype.addRange = function(left, right) {
+  const intervals = [];
+  let placed = false;
+  for (const [start, end] of this.ranges) {
+    if (start > right && !placed) {
+      intervals.push([left, right]);
+      placed = true;
+    }
+    if (end < left || start > right) {
+      intervals.push([start, end]);
+    } else {
+      left = Math.min(left, start);
+      right = Math.max(right, end);
+    }
+  }
+  if (!placed) intervals.push([left, right]);
+  this.ranges = intervals;
+};
+
+/**
+ * @param {number} left
+ * @param {number} right
+ * @return {boolean}
+ */
+RangeModule.prototype.queryRange = function(left, right) {
+  for (const [start, end] of this.ranges) {
+    if (start <= left && end >= right) return true;
+    if (start > left) break;
+  }
+  return false;
+};
+
+/**
+ * @param {number} left
+ * @param {number} right
+ * @return {void}
+ */
+RangeModule.prototype.removeRange = function(left, right) {
+  const intervals = [];
+  for (const [start, end] of this.ranges) {
+    if (end <= left || start >= right) {
+      intervals.push([start, end]);
+    } else {
+      if (start < left) intervals.push([start, left]);
+      if (end > right) intervals.push([right, end]);
+    }
+  }
+  this.ranges = intervals;
+};

README.md

@@ -540,6 +540,7 @@
 712|[Minimum ASCII Delete Sum for Two Strings](./0712-minimum-ascii-delete-sum-for-two-strings.js)|Medium|
 713|[Subarray Product Less Than K](./0713-subarray-product-less-than-k.js)|Medium|
 714|[Best Time to Buy and Sell Stock with Transaction Fee](./0714-best-time-to-buy-and-sell-stock-with-transaction-fee.js)|Medium|
+715|[Range Module](./0715-range-module.js)|Hard|
 717|[1-bit and 2-bit Characters](./0717-1-bit-and-2-bit-characters.js)|Easy|
 720|[Longest Word in Dictionary](./0720-longest-word-in-dictionary.js)|Medium|
 722|[Remove Comments](./0722-remove-comments.js)|Medium|